118174-26-8 CCRIS 2999 Hydrazinecarboxylic acid, 2-(2-quinoxalinylmethylene)-, 1,1-dimethylethyl ester, 1,4-dioxide tert-Butyl 3-(2-quinoxalinylmethylene)carbazate 1,4-dioxide tert-Butyl-3-(2-quinoxalinylmethylene)carbazate 1,4-dioxide